How Credit Cards Affect How Much You Can Borrow for a Home Loan

Yes, and often by more than people expect. When a lender works out how much you can borrow, it builds a picture of your regular financial commitments and subtracts them from your income. Credit cards are part of that picture, but they are not counted on what you currently owe. They are counted on your approved limit.

The reasoning is straightforward from the lender's point of view. A credit limit is money you could draw down at any moment, without asking anyone. Today the balance might be zero; tomorrow you could spend the lot. Because the lender is assessing whether you can afford a mortgage for the next thirty years, it has to assume you might use the full limit available to you, and that you would then have to repay it. At Lender Edge we see this single issue trip up otherwise strong applicants more than almost any other.

So the question a lender really asks is not how much you owe on your cards, but how much you could owe, and what servicing that would cost you.

To turn a credit limit into a figure they can plug into their servicing calculation, lenders apply a notional minimum monthly repayment, expressed as a percentage of the limit. The most common figure is around 3.8% of the limit per month, although some lenders use 3%. This is deliberately higher than the minimum repayment your card provider actually charges, because the lender wants to be conservative.

The table below shows how that plays out across a range of limits, using a 3.8% assessment and an indicative assessed interest rate of around 9.5% over a thirty-year term:

Illustrative only. Assessment percentages and rates differ between lenders, and your actual figures depend on your full circumstances.

The pattern is the one worth sitting with. The reduction in your borrowing power is usually several times larger than the credit limit itself, because a small ongoing monthly commitment translates into a large chunk of loan capacity over a thirty-year term. A single $20,000 card can knock somewhere in the region of $90,000 off the size of the home loan you qualify for.

Yes. This is the part that frustrates borrowers most. You might have a card tucked in a drawer with a zero balance, paid off years ago, kept only for emergencies or because cancelling it never reached the top of the list. To you it costs nothing. To a lender, it is still a $15,000 or $20,000 commitment, because that is what you could spend on it tomorrow.

It is worth knowing that most Australians do repay their cards inside the interest-free period, with roughly half of the national credit card balance accruing no interest at all. Paying your card off diligently is good financial behaviour, but it does not change how the limit is assessed for a home loan. This is why so many borrowers improve their position dramatically simply by reducing or closing cards they had forgotten were even affecting them. It is often the single fastest lever available, and it costs nothing but a phone call or two.

The effect compounds across every facility you hold. If you have three cards with limits of $10,000, $15,000 and $8,000, the lender assesses the combined $33,000 limit, regardless of what is owed across them. At a 3.8% assessment that is around $1,254 a month of notional commitment, which can reduce borrowing capacity by well over $100,000.

It is not only mainstream credit cards that count:

None of these tend to feel like debt in day to day life, which is exactly why they catch people out at application time.

Yes, so simply not mentioning a card is not an option. Under Comprehensive Credit Reporting, your credit file shows your open accounts, their limits, and your repayment history month by month. When you apply for a home loan, the lender pulls that file and sees the full picture, including cards you may have overlooked.

That makes accuracy and preparation far more useful than omission. The goal is not to hide commitments, which cannot be done, but to genuinely tidy up your position before you apply, so that the file the lender sees reflects what you actually need, not credit you are carrying out of habit.

The good news is that credit card limits are one of the easiest things to fix, and the improvement to your borrowing power can be substantial and almost immediate. A few practical steps make the difference:

Reducing card limits sits alongside other quick wins like clearing a small personal loan or paying down a modest HECS balance. If you would like the full picture, our guide on how to improve your borrowing power walks through the levers that move the needle most. And if your card balances are sitting high, rolling them into your mortgage through debt consolidation can free up both cash flow and serviceability, provided you keep the repayments up afterwards. At Lender Edge we will tell you exactly which cards to deal with, and how, before you lodge a single application.

Not every lender assesses credit cards the same way. The difference between a 3% and a 3.8% assessment rate sounds small, but across a $30,000 combined limit it changes the notional monthly commitment by around $240, which can swing your borrowing capacity by tens of thousands of dollars. Some lenders are simply more accommodating than others on how they treat available credit.

This is exactly where working with a broker pays off. Knowing which lender assesses your particular situation most favourably, and matching you to it, is detailed, current, lender-by-lender knowledge. Lender Edge compares more than 35 lenders, charges you no broker fee, and under the best interests duty we are legally bound to act in your favour, not the lender's. Whether you are buying your first home, refinancing, or just trying to understand why your borrowing figure is lower than you expected, Lender Edge will help you get your position into the best possible shape before you apply.